Pawl-and-ratchet mechanism



(No Model.)

0. K. MGINTIRE. PAWL AND RATGHET MBCHANISM. No. 417,269.

Patented Deo. 17, 1889'.

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OLIVER K. MCIN TIRE, OF OGDEN, KANSAS, ASSIGNOR OF ONE-HALF TO )MMA A. REED, OF SPRINGFIELD, OHIO.

PAwL-AN D-'RATGH ETv M Ec HAN lsM.

SPECIFICATION forming part of Letters Patent No. 417,269, dated December 17, 1889.

Application led July 29, 1889. Serial No. 319,002. (No model.)

'T0 all whom, it may concern.-

Be it known that l, OLIVER K. MCINTIRE, a citizen of the United States, residing at Ogden, in the county of Riley and State of Kansas, have invented certain new and useful Improvements in Pawl-andRatchet Mechanism; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference' marked thereon, which form a part of this speciiication.

My invention relates to 'improvements in pawl-and-ratchet mechanism.

My invention relates to that class of pawland1atchet mechanism in which a pinion or sleeve with a ratchet end is loosely mounted upon a shaft, through which latter a key eX- tends across the face of the ratchet, it being held by a pin within an oblong slot, so as to allow it to vibrate back and forth on said pin as the teeth of the ratchet pass over it when the pinion or sleeve is rotated in one direction, and when the motion of theY pinion or.

sleeve is reversed said key acts as a stop to arrest its backward motion by one of its ends contacting with one of the teeth of the ratchet.

The object of the invention is to construct a pawl-and-ratchetl mechanism which, by

reason of its simplicity of construction and' capability of being operated by the slightest exercise of mechanical power, will readily recommend itself to those persons using such devices. y

Figure l is a` perspective view of a clutch embodying my improvement. Fig. 2 is an end view of the same as seen from the right. Fig. 3 is a longitudinal sectional view of the same.

The several iigures `embrace a pinion in connection with the pawl-and-ratchet mechanism as representing a movement most common in its adaptation to lawlmnowers, revolving rakes, dac.

In the drawings, A is a pinion, which is formed at one end with three deep ratchetteeth a a a. Each one of these teeth has its sliding face i (or elevated portion) extending back some distance from the point, the object of which will be explained hereinafter. The pinion A is loosely held on the shaft B between the vibratory key D and a pin c at the opposite end,which latter passes through t-he shaft B, and a washer h is interposed between it and the pinion at this end. The key D is fiat, and is pivoted, midway of its length, in an oblong hole (l, extending through the shaft B, by a pin e, in close conjunction with the ratchet end of the pinion A, while its ends extend radially across the ratchet. The pinion A is free to rotate in one direction only, as shown in the igu res and as indicated by the arrow in Fig. 2. As the pinion revolves in the movement, the ,ends of the key .D alternately rise and fall from the plane of the ratchet-face over the teeth a a a, passing at one end of the key over the depressed portion 7L of the ratchet, while the opposite end rides over the elevated part 1,' behind the point of the tootli,the elevated portion being exactly opposite the depressed portion of the ratchet-face, as seen in the gures, so that the key hugs the latter closely, and upon reversing the motion of the pinion that end of the key in front of the tooth instantly stops the reverse rotation. By reference to Fig. 3 it will be noticed that only a slight space is required between the Washer b and the key D to allow of a slight endwise movement of the piece A in rotating to permit the teeth to pass under key D in the forward rotation. This space is hardly appreciable.

More or less teeth could be used in the ratchet; but due regard must be had in the construction to have each elevated portion c in rear of the point of a tooth exactly opposite' to each depressed portion h in front of a tooth to make the stop positive in the reversing movement.

I am aware that a pawl-and-ratchet mechanism consisting of a shaft on which is mounted a pinion, one of the faces of which is provided with teeth, forming a ratchet, which teeth are designed to be engaged by a pin located within an opening orslot formed within said shaft, is not broadly new. Such construction I therefore do not claim as my invention.

I claim as my invent-ionn ln a pawl-and-ratchet mechanism, a trans- IOO Versely-slotted shaft and a flat key extending` rotation, a pin passing trans\f'ersely through through the slot in said shaft, in combination i the shaft atthe lend of the -pinion opposite with a pinion one of the faces of which is eonl said key for limit-ing` the endwise"movement r 5 strueted with ratchet-teeth which are foi-ined of said pinion7 and a washer between said pin 5 with elevated portions il in rear of their points I and pinion, all substantially as shown and deand depressed portions h in front of the lat- I scribed. ter, the said teeth being engaged by both i In testimony whereof I aiiix my signature ends of said key in a forward movement and in presence of two Witnesses. adapted to form astop with one end when OLIVER K. MCINTIRE.

1o saidmovementis reversechand the said pinion i being movable longitudinally on the shaft to permit its teeth to pass said key in the forward lVitnesses: M. C. WHITE, 1 L. BLUMENSTEIN. 

